UNB heat things up with more 'Black Heart' teaser images

UNB have revealed more concept teaser images for their upcoming release "Black Heart".

UNB revealed a cool, blue tone in their previous teasers, and for their latest teasers, the group heated things up with an orange hue. 'The Unit' project group will be making a comeback with their 2nd mini album 'Black Heart', which releases on June 28 KST.